The purpose of this period of instruction is to familiarize you with the considerations that should be made before choosing a building and how to prop it correctly.
INDIVIDUAL TRAINING STANDARDS
MISSION PERFORMANCE STANDARDS
TERMINAL LEARNING OBJECTIVE
Without aid of references and in accordance with MCWP 3-17, the student will demonstrate the proper techniques for installing props correctly.
ENABLING LEARNING OBJECTIVES
1. Know the minimum size of timber used for props.
2. Know the proper spacing between props.
3. Know the sequence of construction for props.
4. Know the method of propping for multiple floors.
5. Know how to protect the building from collapsing laterally.
METHOD AND MEDIA
This period of instruction will be taught through the lecture and demonstration method.
This period of instruction will be evaluated through practical application during situational training exercises.
1. Types of Propping: If possible, buildings should be selected which are strong enough NOT to need propping. However, for many types of buildings it will be desirable to prop the ceiling in order to decrease the chances of collapse during urban combat. A well-propped room will not collapse on top of defending troops. The three types of props are mechanical, square cut timber props, and round timber uncut.
2. Mechanical Props: These are props that are mechanical in nature and found in hardware stores. They are the most preferred as they can be easily installed.
3. Square Cut Timber Props: These are timbers used for props. An example would be railroad ties.
4. Round Timber Uncut Props: Props made from timber acquired from a wooded area.
5. Equipment: Alternately, propping may be necessary if a unit wishes to build defensive positions on the upper floors of a building. Some floors may not be strong enough to support the weight of sandbags and other material used for the defensive works. Propping will allow upper floors to support heavier weights.
a. Spreaders – these spread the load across a larger area and prevent point loading of floors and ceilings.
b. Acro props.
c. Square cut timber props.
d. Round timber props.
e. Wedges – these are used to ensure a tight fit for the timber props.
f. Timber dogs/nails – dogs or nails will be required to secure the props and wedges in place.
a. Minimum size of timber props is 120mm for square and 125mm diameter for round.
b. Spacing between the props is 1.5 meters maximum for 120mm timbers.
c. Smaller diameter timbers reduce the required distance between props and make movement within the room more difficult.
d. If the ceiling is more than 3 meters in height it is recommended that you use stronger (thicker) props.
7. Propping the Room: Before positioning the props it may be desirable to remove plaster boards or loose plaster from the ceiling. This allows you to see the direction of the ceiling joists aiding in determining the correct orientation of the props. This will also reduce the quantity of dust and debris should the building gets hit by rounds or explosives.
a. Pull down the plaster if desirable.
b. Locate and mark the joists at 1.5 meter intervals (if 120mm props are used).
c. Cut spreaders, they should be the same length as the floor or ceiling.
d. Cut props to fit the area between the floor and ceiling spreaders less one half the thickness of the wedges.
e. Once props are in position either tighten the Acro (mechanical) props or knock the wedges into place. Spike the uprights with timber dogs or nails.
8. Propping Multiple Floors: All props should be vertically in-line (on top of one another) throughout the building. Buildings that are in danger of collapsing laterally should be diagonally braced between the spreaders and the props.
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